feat: add payment notifications and entitlement fulfillment

Tiku.Infrastructure/Commerce/AlipayProvider.cs

@@ -1,5 +1,6 @@
 using System.Text.Json;
 using Aop.Api;
+using Aop.Api.Util;
 using Tiku.Application.Commerce;
 
 namespace Tiku.Infrastructure.Commerce;
@@ -25,9 +26,34 @@ internal sealed class AlipayProvider : IPaymentProvider
         CancellationToken cancellationToken = default)
     {
         _ = BuildClient(account);
-        throw new PaymentProviderException(
-            "Alipay SDK is configured; notification parsing is enabled in the notification batch.",
-            "alipay_notification_not_enabled");
+        var values = ToDictionary(request.Body);
+        var signatureValid = AlipaySignature.RSACheckV1(
+            values,
+            Required(account.ConfigPublic, "alipayPublicKey"),
+            GetString(account.ConfigPublic, "charset") ?? "UTF-8",
+            GetString(account.ConfigPublic, "signType") ?? "RSA2",
+            false);
+        var eventId = GetValue(values, "notify_id") ?? GetValue(values, "trade_no") ?? Guid.NewGuid().ToString("N");
+        var orderNo = GetValue(values, "out_trade_no")
+                      ?? throw new PaymentProviderException("Alipay notification order number is missing.", "alipay_notify_order_missing");
+        var tradeStatus = GetValue(values, "trade_status");
+        var amountCents = YuanToCents(GetValue(values, "total_amount") ?? GetValue(values, "receipt_amount"));
+        DateTimeOffset? paidAt = DateTimeOffset.TryParse(GetValue(values, "gmt_payment"), out var parsedPaidAt)
+            ? parsedPaidAt
+            : null;
+
+        return Task.FromResult(new PaymentNotificationResult(
+            Provider,
+            "payment_notify",
+            eventId,
+            orderNo,
+            GetValue(values, "trade_no"),
+            amountCents,
+            string.Equals(tradeStatus, "TRADE_SUCCESS", StringComparison.OrdinalIgnoreCase) ||
+            string.Equals(tradeStatus, "TRADE_FINISHED", StringComparison.OrdinalIgnoreCase),
+            signatureValid,
+            paidAt,
+            request.Body));
     }
 
     private static DefaultAopClient BuildClient(PaymentProviderAccount account)
@@ -63,4 +89,53 @@ internal sealed class AlipayProvider : IPaymentProvider
             "Alipay provider configuration is incomplete.",
             "alipay_config_incomplete");
     }
+
+    private static Dictionary<string, string> ToDictionary(JsonElement element)
+    {
+        var values = new Dictionary<string, string>(StringComparer.Ordinal);
+        if (element.ValueKind != JsonValueKind.Object)
+        {
+            return values;
+        }
+
+        foreach (var property in element.EnumerateObject())
+        {
+            values[property.Name] = property.Value.ValueKind == JsonValueKind.String
+                ? property.Value.GetString() ?? string.Empty
+                : property.Value.GetRawText();
+        }
+
+        return values;
+    }
+
+    private static string? GetString(JsonElement element, params string[] keys)
+    {
+        if (element.ValueKind != JsonValueKind.Object)
+        {
+            return null;
+        }
+
+        foreach (var key in keys)
+        {
+            if (element.TryGetProperty(key, out var property) &&
+                property.ValueKind == JsonValueKind.String)
+            {
+                return property.GetString();
+            }
+        }
+
+        return null;
+    }
+
+    private static string? GetValue(IReadOnlyDictionary<string, string> values, string key) =>
+        values.TryGetValue(key, out var value) && !string.IsNullOrWhiteSpace(value)
+            ? value
+            : null;
+
+    private static int YuanToCents(string? value)
+    {
+        return decimal.TryParse(value, out var amount)
+            ? (int)Math.Round(amount * 100, MidpointRounding.AwayFromZero)
+            : 0;
+    }
 }